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alluvium
(redirected from Alluvial deposits)

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.07 sec.
alluvium

The material deposited on land by virtue of the process of accretion. The accretion process occurs when rivers or other waters deposit silt and mud on land,and thus create more land; the silt and mud making up the new land is called alluvium.



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From radiocarbon dates of a few alluvial deposits (sediments deposited by streams or rivers) and analyses of soils along the southeastern end of the fault, Madole brackets the time of last movement between 500 and 2,000 years ago.
Pan samples of alluvial deposits at Dime Creek revealed high-grade placer gold and platinum concentrations, as well, as uranium at the head of Quartz Creek.
The alluvial deposits on Dime Creek are composed of mostly volcanic andesite and basalt sand and gravel with occasional cobbles of intrusive olivine dunite.
 
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